Stop-check valve

Abstract

A stop-check valve includes inside a valve body a swing check valve disc and a contacting projection. A vertically mounted valve rod provided with a handwheel and having at the lower end a structure of a cylindrical contact portion is further included. The contact portion is vertically movable in coupling arrangement with the valve rod and capable of contacting with the contacting projection on the valve disc.

What is claim is: 
     
       1. A stop-check valve, comprising a valve body, a swing-type check valve disc mounted in said body and having an inlet side and an outlet side, a contacting projection formed on said outlet side of said valve disc, a rotatable and axially fixed valve rod positioned in said body generally perpendicular to a flow path of fluid through said valve, one end of said valve rod having an axially fixed handwheel attached thereto, another end of said valve rod being threaded and positioned proximate said outlet side of said valve disc, and a contact portion threadedly coupled with said threaded end of said rod, and interengaging means on said valve body and said contact portion for preventing rotation of said contact portion, and said contact portion being axially movable along said rod upon rotation of said rod for operatively engaging said contacting projection. 
     
     
       2. A stop-check valve according to claim 1, wherein said contact portion has a vertically oriented threaded hole which is threadedly engaged by a threaded portion of said valve rod for threadedly axially moving said contact portion along said valve rod such that said axial movement of said contacting portion along said threaded portion of said valve rod regulated the degree of opening of said valve disc relative a valve seat. 
     
     
       3. A stop-check valve according to claim 2, wherein said contact portion has formed on the side facing said check valve disc on the lower end of the cylinder an edge of a curved contact boss to facilitate contacting. 
     
     
       4. A stop-check valve according to claim 1, wherein said contact portion comprises a cylinder, said interengaging means comprising a pair of rod-like guide protuberances on two sides of said cylinder respectively slidably mounted between opposed guide surfaces of a pair of guide grooves defined on the inside wall of said valve body.